/*******************************************************************************
 * Copyright (c) 2012, 2020 IBM Corp.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * and Eclipse Distribution License v1.0 which accompany this distribution. 
 *
 * The Eclipse Public License is available at 
 *   https://www.eclipse.org/legal/epl-2.0/
 * and the Eclipse Distribution License is available at 
 *   http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *    Ian Craggs - initial contribution
 *******************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "MQTTClient.h"

#include "config_mqtt_dl.h"

volatile MQTTClient_deliveryToken deliveredtoken;

void delivered(void *context, MQTTClient_deliveryToken dt)
{
    printf("Message with token value %d delivery confirmed\n", dt);
    deliveredtoken = dt;
}

int msgarrvd(void *context, char *topicName, int topicLen, MQTTClient_message *message)
{
    printf("Message arrived\n");
    printf("     topic: %s\n", topicName);
    printf("   message: %.*s\n", message->payloadlen, (char*)message->payload);
    MQTTClient_freeMessage(&message);
    MQTTClient_free(topicName);
    return 1;
}

void connlost(void *context, char *cause)
{
    printf("\nConnection lost\n");
    printf("     cause: %s\n", cause);
}

int main(int argc, char* argv[])
{
	MQTTClient client;
	MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer;
	int rc;

	if ((rc = MQTTClient_create(&client, ADDRESS, CLIENTID,
					MQTTCLIENT_PERSISTENCE_NONE, NULL)) != MQTTCLIENT_SUCCESS)
	{
		printf("Failed to create client, return code %d\n", rc);
		rc = EXIT_FAILURE;
		goto exit;
	}

	if ((rc = MQTTClient_setCallbacks(client, NULL, connlost, msgarrvd, delivered)) != MQTTCLIENT_SUCCESS)
	{
		printf("Failed to set callbacks, return code %d\n", rc);
		rc = EXIT_FAILURE;
		goto destroy_exit;
	}

	conn_opts.keepAliveInterval = 20;
	conn_opts.cleansession = 1;
	conn_opts.username=USERNAME;
	conn_opts.password=PASSWORD;
	if ((rc = MQTTClient_connect(client, &conn_opts)) != MQTTCLIENT_SUCCESS)
	{
		printf("Failed to connect, return code %d\n", rc);
		rc = EXIT_FAILURE;
		goto destroy_exit;
	}

	printf("Subscribing to topic %s\nfor client %s using QoS%d\n\n"
			"Press Q<Enter> to quit\n\n", TOPIC, CLIENTID, QOS);
	if ((rc = MQTTClient_subscribe(client, TOPIC, QOS)) != MQTTCLIENT_SUCCESS)
	{
		printf("Failed to subscribe, return code %d\n", rc);
		rc = EXIT_FAILURE;
	}
	else
	{
		int ch;
		do
		{
			ch = getchar();
		} while (ch!='Q' && ch != 'q');

		if ((rc = MQTTClient_unsubscribe(client, TOPIC)) != MQTTCLIENT_SUCCESS)
		{
			printf("Failed to unsubscribe, return code %d\n", rc);
			rc = EXIT_FAILURE;
		}
	}

	if ((rc = MQTTClient_disconnect(client, 10000)) != MQTTCLIENT_SUCCESS)
	{
		printf("Failed to disconnect, return code %d\n", rc);
		rc = EXIT_FAILURE;
	}
destroy_exit:
	MQTTClient_destroy(&client);
exit:
	return rc;
}
